Let WordData share a common part from PhraseData.
Let word array be sorted by text first, and be sorted again by phone.
Restore but disable check-each-word-in-phrase code.
Only store length-at-least-2 phrases.
Let word_data and phrase_data merge into dictionary.dat
Let compare_word_by_phone() sort reversely.
Let word_data be first-level children of index tree.
Enhance comment for construction process, let it be recognized as 3 major steps.
Remove index-relative code from NODE.